<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click="handler">修改数组数据</button>
        <ul>
            <li v-for="item in person" :key="item">{{item}}</li>
        </ul>
    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                   person:["小杨","小铮","小王","好的"]
                }
            },
            methods: {
                handler(){
                     //1.我们不能直接通过下标修改某一个数组的值(不具备响应式)
                    // this.person[0] = "lucy";
                    //2.我们不能直接通过修改length修改数组的值(不具备响应式)
                    // this.person.length = 1;
                    //3.推荐使用数组的变更方法修改数组(push\pop\shift\unshift\splice\sort\reverse)
                    // this.person.push("lily");
                    //4.我们可能使用非变更方法要修改数据的值,则直接重新对数值进行赋值即可
                    /*  this.person = this.person.filter((item) => {
                    return item.startsWith("小");
                    }); */
                    this.person = this.person.map((item) => {
                    return item + "1";
                    });
                }
            },
        })
</script>
</body>

</html>